package com.homegoods.classify.widget;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;

/**
 * add shibo.zheng
 * 19/06/18
 * recyclerview横线
 */

public class DividerltemDecoration extends RecyclerView.ItemDecoration{

    // 默认分隔条Drawable资源的ID
    private static final int[] ATTRS = { android.R.attr.listDivider };

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    // 分隔条Drawable对象
    private Drawable mDivider;

    //方向;水平/垂直
    private int mOrientation;
    private int orientation;

    public DividerltemDecoration(Context context, int orientation) {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        // 获取系统提供的分隔条Drawable对象
        mDivider = a.getDrawable(0);
        // 回收TypedArray所占用的空间
        a.recycle();
        setOrientation(orientation);
    }

    //设置方向
    public void setOrientation(int orientation) {
        if(orientation != HORIZONTAL_LIST && orientation!=VERTICAL_LIST)
        {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @SuppressLint("LongLogTag")
    @Override
    public void onDraw(Canvas c, RecyclerView parent)
    {
        Log.v("recyclerview - itemdecoration","onDraw()");
        if (mOrientation == VERTICAL_LIST){
            drawVertical(c,parent);
        }else {
            drawHorizontal(c,parent);
        }
    }

    private void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount = parent.getChildCount();

        for (int i=0;i<childCount;i++){
            final View child =parent.getChildAt(i);
            android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext());
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams)child.getLayoutParams();
            final int top = child.getBottom()+params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left,top,right,bottom);//绘制范围
            mDivider.draw(c);//施行绘制
        }
    }

    private void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();

        final int childCount = parent.getChildCount();

        for (int i=0;i<childCount;i++){
            final View child =parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams)child.getLayoutParams();
            final int left = child.getBottom()+params.rightMargin;
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left,top,right,bottom);//绘制范围
            mDivider.draw(c);//施行绘制
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
        if(mOrientation == VERTICAL_LIST){
            outRect.set(0,0,0,mDivider.getIntrinsicHeight());
        }else {
            outRect.set(0,0,mDivider.getIntrinsicWidth(),0);
        }
    }
}
